Motor-controlling means



Oct. 22, 1929.

O. HOVE MOTOR CONTROLLING MEANS Filed March 15, 1928 2 Sheets-Sheet 1anomup Oct. 22, 192-9. o, Hov 1,733,062

MOTOR CONTROLLING MEANS Filed March 15, 1928 2 Sheets-Sheet 2 PatentedOct. 22, 1929 'OLE HpVE, OF ATASGADERO, CALIFORNIA MOTOR-CONTROLLINGMEANS Application filed March 15, 1928. Serial No. 262,022.

The invention relates to automatic controlling means for the drivingmotor of a machine embodying a work performing member, a work supportmovable toward and from said member, and a power controlling device forthe motor having a control member movable from one position at which themotor merely idles, to another position at which the power of the motoris increased for work performing- One illustration of such a machine isa buzz-saw for-cord wood andthe like, in which the work performingmember is the saw; the work support, the pivoted or slidable table; themotor, a gasoline engine; its .car-

bfureter, the controlling device; and the throttle valve, the ,controlmember; 1

It is .the principal object of the invention to provide novel andefficient means controlled by movementzot thework support, for sooperating said control member as to automatically increase the power .ofthe motor as .said worksupport advances the work to the work performingmember, and to restore said motor .to idling when the work has beenperformed. In the saw herein .disclosed, the motor speed is increasedautomatically each time .a cut is made and after making such cut, itagain idles until the next cut is to be made.

With the foregoing in View, :the invention residesin the novelsubjectmatter hereinafter described and; claimed, description beingaccomplished by reference to the accompanying s5 drawings. 7 4 i Fig. 1is aside elevation partly broken away and insection showingfia buzz-sawembodying the invention, the .parts being in such positions that themotor merely idles.

Fig.2-is a Viewssimilar to Fig. l butshowthe pivoted-table .advanced'andthe'throttle valvepositioned for increasing thespeed and consequentlythe power of the .motor.

Eig. :3.zis a detail View similar to Fig; 2 but showing. the manner'inwhich the throttle valve is restored to idling position, as soon,asthe]work-supporting table starts on its return movement.-

'Fig. lisa perspective view of a number of zparts'of the presentinvention.

Fig. 5 is a detail sectional View on line 5-75 of Fig. 4.

Fig. 6 is a top plan view showing a different form of saw embodying theinvention.

Fig. 7 is a view similar to Fig. l but illustrating a modifiedconstruction of the throttle valve controlling means.

The form of construction shown in Figs. 1 to .5 will first be described.

The numeral 8 denotes the frame of a 9!) portable buzz-saw mounted onappropriate wheels 9. This frame carries a driving motor 10 for the saw11, and a table 12 is pivotally mounted at 13 for movement toward andfrom the saw. 14 denotes the carburetor of the motor 10, and'15 hasreferenceto the throttle. valve which always occupies a motor idlingposition when the saw is not performing work. In carrying out myinvention, how.- ever, I make novel provision for automat- 1.70 icallymoving the throttle valve to increase the power of the motor when thetable 12 is advanced to present the-work NV to the saw- 16 denotes acurved track concentric with the pivot '13, secured at .one'end to thetable 12, as. denoted at 17, and projecting forwardlfrom said table, theadvance end of said tra being provided with acam 18. 1.9 has refier- 1ence to a spring arm which is stationary with respecttothe track 16 andthe table 12, said .80 track being normally in rear of said spring armas'shown inFig. 1.1 This arm extends I in the same general directionasthe track1r6, is suitably anchored at one of its ends as denoted at20, but is free at its other end. .85 Fulcrumed between its ends at'2l,on the free end of the-spring arm 19, is a short lever 22 whose lowerend constitutes .a shoe 23, co.-

operable with the track 16, the upper end of this lever being connectedby a 2t-with .90

the throttle, valve15. i

any swinging movement under the influence of the cam, by ashoulder orithe'3like'25. The result. is that the cam 18. effects upward. shift.-ing of the lever 22 and the link .24 as a sintor as the work W isadvanced to the saw 11.

As long as the carriage 12 is forced inwardly, the shoe 23 remains uponthe track 16, in such position as to hold the throttle valve open. Justas soon as the outward movement of the table 12 starts, however, thelever 23 is rocked away from the shoulder 25 and the spring 19 comesinto play to move the parts downwardly to completely move the throttlevalve to motor idling position, as seen in Fig. 3. As soon as the track16 clears the shoe v23, the spring 19 which is still under some degreeof tension, pulls downwardly upon the lever 23 and restores it to theupright position shown in Fig. 1 in readiness for operation the nexttime the carriage or table 12 is forced toward the saw. Thus, each timethis carriage or table is moved to advance the work to the saw, thepower of the motor 10 is automatically increased, and as soon as saidcarriage or table starts outwardly, the motor is restored to idling.Thus, proper control of the motor is effected without the necessity ofany governor and the results obtainable are better than those attainedby the use of such a governing device. 7.

In the preferred form of construction, the details "shown most clearlyin Fig. 4' and 5, are employed. In these views, 26 denotes a metal platesecured by bolts 27 to the free end of the spring arm 1.9, said platehaving ears projecting upwardly and longitudinally'therefrom, said earsbeing denoted at 28. The lever 22 is receivedhetween these ears and is.preferably formed from a plate of substantially the same construction asthe part 26. v l

In Fig.6, a'slidable carriage or table 12 such as those commonly used onslidable table saws is provided for advancing the work to the saw 11,the latter being driven bya motor 10 whose carbureter is denoted at 14",and the throttle valve at' 15 16 denotes a track on the table orcarriage 12 having a cam 18 at its advance end, and D denotes a deviceconstructed and operating in the same manner as the parts 192223 --24,above'described. 24 however denotes 'a link or rod of greater lengththan the link 24 but suitably connected with the throttle valve 15 Thisrod preferably carries a'nut 29 cooperable with a stop 30 to act asadjustable limiting means for the return or closing movement of thethrottle valve. In Fig. 7, the parts 10", 11 12 14 15 16 and 18correspond to the similarly numbered portions of Figs. 1, 2 and 3. Thethrottle valve 15 however, is connected by an adjustable link 31, with alever 32 which is fulcrumed between its endsat 34 upon a suitablesupport. Pivoted upon the end of this lever toward the track 16 is amember 35 whose lower end 36 constitutes a shoe for co-action with thecam 18 and the upper edge of the track 16. A stop 37 is provided toprevent the member 35 from swinging about its pivot when the cam 18"-forces against said member, so that swinging of lever 32 will then beeffected to open the throttlevalve. The valve remains open as long asthe table or the like 12 is being advanced, but as soon as this table isreversed, member 35 is swung about its pivot and lever 32 is restored tomotor idling position, by an appropriate spring 38. 7

When adapting the invention to one kind of saw or another, the detailsherein disclosed are preferably followed. However, it will be understoodthat the invention is applicable also to other kinds of machines andthat within the scope of said invention as claimed, numerous variationsmay be made. I claim 1. In a machine having a workperforming member, awork support movable toward and from said member, a motor'connected withsaid member for driving the same, and a power controlling device forsaid motor having a control member movable from a normal motor idlingposition to a power;

increasing position; means actuated by said work support for moving saidcontrol member automatically to said power increasing position uponadvancement of said work support toward said work performin member andfor automatically restoring said control member completely to said motoridling position upon initial return movement of said work support.

2. In a machine having a work performing 5 member, a work supportmovable toward and from said member, a motor connected with said memberfor driving the same, and a power controlling device for said motorhaving a control member movable from a normal motor idling position to apower increasing position; a track carried by said work support andextending in the direction of movement thereof, a shoe substantiallystatienarily mounted-with respect to said track but mounted for movementto one position under the influence of said track upon advance of thework support and track and to another position upon return of said worksupport and track, and means operatively connecting said shoe with saidcontrol member for transmitting motion from one to the other, whereby toincrease the power of the motor immediately upon work advancement and torestore said motor to idling upon initial work retraction.

3. In a machine having a work performing member, a work support movabletoward and from said member, a motor connected with said member fordriving the same, and a power controlling device for said motor having acontrol member movable from a normal motor idling position to a powerincreasing position; a track carried by said work support and extendingin the direction of movement thereof, a spring arm stationarily mountedwith respect to said track, said arm being disposed near and extendingin the same general direction as said track, said arm being secured atone end and free at its other end, a short lever transverse to said armand fulcrumed to said free end thereof, said lever having one endpositioned to be struck by the advance end of said track, said track endbeing provided with a cam for bodily moving the lever and springing saidarm away from the track, means for preventing swinging of said leverwhen forced by said cam, but for permitting free swinging of said leverupon reverse movement of said track, and connecting means between saidlever and said control member for utilizing the cameffected movement ofthe former to move said control member to power increasing position andfor utilizing the track-effected swinging of the lever to restore saidcontrol member to said motor idling position.

In testimony whereof I have hereunto affixed my signature.

OLE HOVE.

